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6축 병렬형 시뮬레이터를 이용한 무인 차량의 원격 조종 구현
김경달(Kyoung Dal Kim),문영근(Young Geun Moon),이승희(Seung Heui Lee),이민철(Min Cheol Lee),유완석(Wan Suk Yoo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The research uses a vehicle simulator for the sense of the real operating of the remote control vehicle system. A dynamics signal uses the vehicle simulator of virtual reality base. But, the remote control vehicle system provides a dynamic signal of real vehicle. The real vehicle signal conjugates a signal of three-ax is acceleration and angular velocity sensor. The real vehicle signal for washout filter input application analyzes a power spectrum of frequency domain. The dynamics signal and real vehicle signal analyze an output signal of washout filter. This study constructs a sense of the real operator system of remote control vehicle.
최재영 ( Jae Young Choi ),김경달 ( Kyung Dal Kim ),박재경 ( Jai Kyoung Park ),김낙인 ( Nack In Kim ) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.4
N/A It is known that skin diseases ar related to proliferation of cellular components. Green tea has m a v favorable biologic effects: anti-inflammatory, antibacterial. antiviral effects. lowering of plasma cholesterol and triglyadde levels, reduction of blood pressure and platelet aggregation, antimuragenic, and anticarcinogenic activities. The effects of green tea on various cells in skin has been reported in previous studies; For keratinocytes and hmnan epidermoid carcinoma cells, green tea induces apoptosis only in cells, but no keratinocytes. For endothelial cells, green tea inhibits endothelial cell proliferation cancer melanocytes and fibroblast, it is little known. We investigated the effects of green tea polyphenol(GTP) and the major constituents, (-)-epieallocatechin-3-gallate(EGCG) on the proliferation in the cultured human keratinocytes, fibroblasts, melanocytes, endothelial cells and human epidermoid carcinoma cells(A431 cells). The prolifertive response was studied by the cell count and the uptake of vitiated thymidine after 48 hours of treatment. And we also observed apoposs using TUNEL staining. The results were as follows; Number of living cells were significantly decreased(p<0,05) in cultured human epidermal cells, melanocytes, fibroblasts, endothelial cells and A431 cells treated with different concentration of GTP and EGCG for 48 hours. The cells were decreased dose dependently as increase of concentration of the extracts. The [3H]thymidine incorporation w significantly decreased(p<0.05) in cultured human epidermal cells, melanocytes, fibroblasts, endothelial cells and A431 cells treated with different concentration of GTP and EGCG for 48 hours. The dose dependent inhibition was also seen in [^3H]thymidine incorporation by green tea extracts. Cell proliferation was significantly more inhibited(p<0.05) by EGCG compared to GTP in the same concentration. We
KAAS 차량 시뮬레이터의 워시아웃 알고리즘 감성 평가
이민철(Min Cheol Lee),김문식(Moon Sik Kim),김경달(Kyoung Dal Kim),문영근(Young Ceun Moon) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
A vehicle driving simulator is a virtual reality device which makes a man feel as if he drove an actual vehicle. Unlike actual vehicles, the simulator has limited kinematic workspace and bounded dynamic characteristics. So it is difficult to simulate dynamic motions of a multi-body vehicle model. In order to overcome these problems, a washout algorithm which controls the workspace of the simulator within the kinematic limitation is needed. However, a classical washout algorithm contains several problems such as generation of wrong sensation of motions by filters in tilt coordination, requirement of trial and error method in selecting the proper cut-off frequencies, difficulty in returning the simulator to its origin using only high pass filters and etc. This paper proposes new tilt coordination method as an algorithm which gives more accurate sensations to drivers. To reduce time in returning the simulator to its origin, an algorithm that applies selectively onset mode from high pass filters and return mode from error functions is proposed. As a result of this study, the results of the proposed algorithm are compared with the results of classical washout algorithm through the human perception models. Also, the performance of the suggested algorithm is evaluated by using human perception and sensibility of some drivers through experiments. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here.